JP2012198451A - Optical fiber holding member, component for photoelectric conversion module, and method for manufacturing component for photoelectric conversion module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber holding member which allows optical transmission of high reliability and is free from the reduction of yield, a component for a photoelectric conversion module, and a method for manufacturing a component for a photoelectric conversion module.SOLUTION: An optical fiber holding member 11 has an optical fiber insertion hole 13, to which a glass fiber is to be inserted, formed therein and includes a ferrule 12 having an electrode 14 provided at a front end 22a thereof on the front side in a glass fiber insertion direction. In the ferrule 12, an adhesive storage part 27 continuous to the optical fiber insertion hole 13 is formed along the optical fiber insertion hole 13 from an entrance for insertion of the glass fiber.

Description

  The present invention relates to an optical fiber holding member used for optical transmission or the like, a photoelectric conversion module component, and a method for manufacturing a photoelectric conversion module component.

As the speed of signals between LSIs increases, it is becoming difficult to eliminate noise and increase in power consumption by electrical transmission. Therefore, in recent years, attempts have been made to transmit between LSIs by optical communication with almost no electromagnetic interference or frequency dependent loss.
As an optical wiring component used for this optical transmission, an optical semiconductor element is mounted at a holding hole opening position of an optical transmission line holding member having an electric wiring, and is electrically connected to an element connecting portion of the electric wiring. An optical transmission line such as a fiber or an optical waveguide is mounted, and an optical semiconductor element and an optical transmission line are fixed to an optical transmission line holding member with an adhesive (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 2007-3906

  In the optical wiring component as described above, an optical semiconductor element (VCSEL, PD, etc.) is mounted at the tip of a ferrule that is an optical transmission path holding member. After mounting the optical semiconductor element, an optical fiber as an optical transmission path is inserted into the holding hole from the opposite side of the optical semiconductor element. At this time, before inserting the optical fiber, an adhesive having a low viscosity is applied to the holding hole, and the optical fiber is inserted so as to push the adhesive toward the tip side of the ferrule. As a result, the air existing in the holding hole is also pushed out together with the adhesive to the tip side of the ferrule, and finally, only the adhesive exists between the optical semiconductor element and the optical fiber end face. It becomes.

However, when an optical fiber is inserted by filling an adhesive into the holding hole of the ferrule, air bubbles are caught in the holding hole due to wettability in the holding hole or an adhesive flow at the time of applying the adhesive, and the air bubbles are trapped in the optical path. It may remain inside.
Then, the remaining bubbles cause a decrease in the coupling efficiency between the optical semiconductor element and the optical fiber and a variation in light intensity, resulting in a decrease in the reliability of optical transmission between the optical semiconductor element and the optical fiber and the product yield. There is a risk of lowering. In particular, the influence is large in an optical wiring component that holds a plurality of optical fibers.

For this reason, the filling method of the adhesive agent which suppresses bubble remaining can be considered. For example, as shown in FIG. 14 (a), the filling needle 1 is inserted into the holding hole 3 of the ferrule 2, and its tip is disposed in the vicinity of the optical semiconductor element 4 mounted on the ferrule 2. In this state, as shown in FIG. 14 (b), the needle 1 is pulled out from the holding hole 3 as shown in FIG. 14 (c) while discharging the adhesive 5 from the tip of the needle 1. In this way, the adhesive 5 is filled in the holding holes 3 without any remaining bubbles. If the optical fiber is inserted into the holding hole 3 after filling with the adhesive 5 in this way, residual bubbles between the optical semiconductor element 4 and the optical fiber can be eliminated.
However, since the inner diameter of the holding hole 3 is substantially the same as the outer diameter of the optical fiber, when the optical fiber is inserted into the holding hole 3, the adhesive 5 filled in the holding hole 3 is connected to the optical semiconductor element 4. The pressure is applied to the optical semiconductor element 4. As a result, the bumps 7 connected to the electrodes 6 of the ferrule 2 are removed, resulting in poor connection, which may reduce the yield.

  An object of the present invention is to provide an optical fiber holding member, a component for photoelectric conversion module, and a method for manufacturing a component for photoelectric conversion module that are capable of highly reliable optical transmission and do not cause a decrease in yield. It is in.

An optical fiber holding member of the present invention capable of solving the above-described problems has a ferrule in which an optical fiber insertion hole into which an optical fiber is inserted is formed and an electrode is provided at a front end on the front side in the insertion direction of the optical fiber. An optical fiber holding member,
The ferrule is characterized in that an adhesive accommodating portion continuous with the optical fiber insertion hole is formed along the optical fiber insertion hole from an entrance through which the optical fiber is inserted.

  The optical fiber holding member of this invention WHEREIN: It is preferable that the said adhesive agent accommodating part is continuously formed to the front-end surface of the said ferrule.

The component for the photoelectric conversion module of the present invention is an optical fiber that is inserted into and fixed to the optical fiber holding member according to any of the present invention and the optical fiber insertion hole formed in the ferrule of the optical fiber holding member. And an optical device attached to the front end of the ferrule in a conductive connection with the electrode,
The optical fiber is fixed in a state of being inserted into the optical fiber insertion hole by an adhesive filled in the optical fiber insertion hole.

  In the component for the photoelectric conversion module of the present invention, it is preferable that a tip surface of the optical fiber is inclined with respect to a direction perpendicular to the optical path axis.

The method for manufacturing a component for a photoelectric conversion module according to the present invention includes an optical fiber holding unit including a ferrule in which an optical fiber insertion hole into which an optical fiber is inserted is formed and an electrode is provided at a front end on the front side in the optical fiber insertion direction. An optical device attached to the front end of the ferrule in a conductive connection state with a member, an optical fiber inserted into the optical fiber insertion hole formed in the ferrule of the optical fiber holding member, and fixed to the electrode An adhesive container that is continuous with the optical fiber insertion hole is formed along the optical fiber insertion hole from the entrance through which the optical fiber is inserted. A manufacturing method comprising:
With the optical device attached to the front end of the ferrule, the optical fiber insertion hole is filled with an adhesive,
By inserting the optical fiber from the rear end of the ferrule into the optical fiber insertion hole, the adhesive in the optical fiber insertion hole is sent to the adhesive container, and then the adhesive is cured. Features.

  In the method for manufacturing a component for an photoelectric conversion module according to the present invention, a cylindrical member for filling is inserted into the optical fiber insertion hole, and a tip thereof is disposed in the vicinity of the optical device in the optical fiber insertion hole. It is preferable to fill the optical fiber insertion hole with the adhesive by pulling out the cylindrical member from the optical fiber insertion hole while discharging the adhesive from the tip.

  According to the present invention, the adhesive accommodating portion continuous to the optical fiber insertion hole of the ferrule is formed along the optical fiber insertion hole from the entrance through which the optical fiber is inserted. Accordingly, when the optical fiber is inserted by filling the optical fiber insertion hole with the adhesive, the adhesive escapes to the adhesive accommodating portion and is pushed out toward the entrance through which the optical fiber is inserted. Therefore, by filling the optical fiber insertion hole with an adhesive, it is possible to prevent the bubbles from being mixed and to eliminate bubbles remaining in the optical path between the optical device and the optical fiber. Further, since no great pressure is applied to the adhesive when inserting the optical fiber, the application of pressure to the optical device can be suppressed as much as possible to prevent problems such as poor connection. Therefore, it is possible to eliminate a decrease in coupling efficiency between the optical device and the optical fiber and a variation in light intensity, and it is possible to improve the reliability of optical transmission and the yield.

It is a figure which shows an example of the optical fiber holding member which concerns on embodiment of this invention, Comprising: (a) is the perspective view of the front side seen from the lower surface side, (b) is the perspective view of the back side seen from the upper surface side. is there. It is a figure which shows the optical fiber holding member of FIG. 1, Comprising: (a) is a front view, (b) is a back view, (c) is a rear view, (d) is a side view of the state upside down. . It is sectional drawing of the optical fiber holding member of FIG. It is a schematic front view of the optical fiber holding member of FIG. It is sectional drawing which shows an example of the components for photoelectric conversion modules which concern on embodiment of this invention. It is an enlarged view of the front-end | tip part of glass fiber. It is sectional drawing which shows an example of the photoelectric conversion module which concerns on embodiment of this invention. It is a perspective view of the components for photoelectric conversion modules and the optical connector which concern on embodiment of this invention. It is a figure which shows the manufacturing process of the components for photoelectric conversion modules using the optical fiber holding member which concerns on embodiment of this invention, Comprising: (a)-(c) is sectional drawing, respectively. It is a schematic sectional drawing of the optical fiber holding member in the middle of manufacture of the components for photoelectric conversion modules. It is sectional drawing which shows the modification of the components for photoelectric conversion modules using the optical fiber holding member which concerns on embodiment of this invention. It is sectional drawing which shows the modification of the optical fiber holding member which concerns on embodiment of this invention. It is a schematic front view which shows the modification of the optical fiber holding member which concerns on embodiment of this invention. It is a figure which shows an example of the adhesion fixing process of the optical fiber to an optical fiber holding member, Comprising: (a)-(c) is sectional drawing, respectively.

Hereinafter, an example of an embodiment of a manufacturing method of an optical fiber holding member, a photoelectric conversion module component, and a photoelectric conversion module component according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the optical fiber holding member 11 includes a ferrule 12, and the ferrule 12 is integrally formed of resin. The ferrule 12 is made of a thermoplastic resin mainly composed of polyphenylene sulfide (PPS). A thermoplastic resin mainly composed of polyphenylene sulfide is a resin excellent in precision moldability, and is suitable for use in the ferrule 12 that requires precision molding. Further, the thermoplastic resin mainly composed of polyphenylene sulfide is a resin having a small coefficient of linear expansion and excellent heat resistance.

  As shown in FIG. 3, the ferrule 12 includes a front end portion 22 and a rear end portion 23. The front end portion 22 is thinner than the rear end portion 23, and the width dimension is also reduced. . The thickness of the front end portion 22 is formed as thin as possible within a range in which sufficient mechanical strength can be secured. The upper and lower surfaces of the front end portion 22 of the ferrule 12 are formed so as to be parallel to the axis of the optical fiber insertion hole 13.

  A plurality of optical fiber insertion holes 13 are formed in the ferrule 12 from the front end 22 a of the front end portion 22 to the rear end 23 a of the rear end portion 23, and these optical fiber insertion holes 13 are spaced in the width direction of the ferrule 12. It is arranged with a gap. Built-in glass fibers (optical fibers) 32 to be described later are inserted into and fixed to the optical fiber insertion holes 13 from the rear end 23a side of the ferrule 12.

  As shown in FIGS. 3 and 4, the ferrule 12 is formed with an adhesive container 27 that is continuous with the optical fiber insertion hole 13. The adhesive accommodating portion 27 is formed to extend from the entrance through which the glass fiber 32 is inserted into the optical fiber insertion hole 13 to the end surface of the front end 22 a of the ferrule 12 along the optical fiber insertion hole 13. The adhesive accommodating portion 27 is formed above the optical fiber insertion hole 13 and has a width dimension smaller than the inner diameter of the optical fiber insertion hole 13.

  The front end portion 22 of the ferrule 12 is provided with a plurality of electrodes (lead frames) 14 extending in the thickness direction at the front end 22a. These electrodes 14 are integrally provided on the front end 22a of the ferrule 12 by, for example, insert molding. That is, the ferrule 12 is integrally formed with the plurality of electrodes 14. And the edge part of the electrode 14 is exposed to the upper and lower surfaces of the front-end part 22 of the ferrule 12, and a part of this exposed electrode 14 is provided as the pad surface 14a.

  Further, a rib 20 projecting in the axial direction of the optical fiber insertion hole 13 from the front end 22a is provided at the front end 22a of the ferrule 12 in the circumferential direction, and the rib 20 has a circumferential direction at the front end 22a of the ferrule 12 A cutout portion 20a is formed in a part of each of them (in this embodiment, both sides of the ferrule 12). Thereby, the front end 22a of the ferrule 12 is made into the shape which has the rib 20 over the width direction at the up-and-down edge part.

  The base portion on the rear end portion 23 side of the front end portion 22 of the ferrule 12 is formed so as to gradually increase in thickness and width toward the rear end portion 23 side. Thereby, the stress concentration in the root portion of the front end portion 22 is suppressed. The cross-sectional shape in the thickness direction and width direction of the base portion of the front end portion 22 may be an arc shape or a tapered shape.

  Further, the ferrule 12 is formed with a guide portion 24 that is open at the rear end 23 a with respect to the axis of the optical fiber insertion hole 13 along the arrangement of the optical fiber insertion holes 13. A plurality of guide grooves 24 a connected to the optical fiber insertion hole 13 are formed in the guide portion 24, and the upper portions of the guide grooves 24 a are opened. The portion of the optical fiber insertion hole 13 connected to the guide portion 24 is an insertion guide hole 13b that is gradually enlarged in diameter toward the guide portion 24, and smooth insertion of the glass fiber 32 into the optical fiber insertion hole 13 is performed. It is planned.

  The rear end portion 23 of the ferrule 12 is formed with positioning holes (positioning guides) 25 at both ends thereof. In these positioning holes 25, positioning pins (positioning guides) 47 mounted on the optical connector 50 described later can be inserted. By inserting the positioning pins 47 into the positioning holes 25, the optical connector 50 is connected to the rear end 23a of the ferrule 12 while being positioned.

Next, the photoelectric conversion module component and the photoelectric conversion module will be described.
As shown in FIG. 5, the photoelectric conversion module component 30 is fixed by inserting a glass fiber 32 having a core and a clad into the optical fiber insertion hole 13 of the ferrule 12 constituting the optical fiber holding member 11. . These glass fibers 32 are formed so that the front ends thereof are substantially smooth, and may contact the optical device 41 unless excessive pressure is applied to the optical device 41, but preferably the front end 22 a of the ferrule 12. On the same plane or at a position slightly drawn into the optical fiber insertion hole 13.

  As shown in FIG. 6, the glass fiber 32 may have its tip cut obliquely with respect to a direction perpendicular to the optical path axis Ax. When the tip of the glass fiber 32 is cut obliquely, the reflection of light during optical transmission with the optical device 41 can be minimized. When the optical device 41 is perpendicular to the optical path axis and the tip of the glass fiber 32 is cut obliquely, the optical path axis of the optical device 41 and the glass fiber 32 coincide with each other. As compared with the case where the optical device 41 is inclined with respect to the direction perpendicular to the optical path axis, the mounting tolerance is increased. In particular, in the case of a multimode fiber, the generation of speckle noise in the transmitted light can be suppressed.

In addition, when the tip of the glass fiber 32 is cut obliquely in this way, when the glass fiber 32 is inserted into the optical fiber insertion hole 13, bubbles remaining on the front side in the insertion direction are favorably sideways. Extruded. Therefore, the bubbles in the optical fiber insertion hole 13 are smoothly sent out to the adhesive accommodating portion 27.
The outer edge of the glass fiber 32 is preferably chamfered. If the glass fiber 32 is chamfered in this way, when the glass fiber 32 is inserted into the optical fiber insertion hole 13, the end surface of the glass fiber 32 is the optical fiber. The inner peripheral surface of the insertion hole 13 is not shaved.

An optical device 41 is attached between the ribs 20 at the front end 22 a of the ferrule 12. The optical device 41 has an element portion 42 and a terminal portion 43 on an element surface that is an attachment surface attached to the front end 22 a of the ferrule 12.
The optical device 41 is, for example, a light emitting element or a light receiving element such as a VCSEL (Vertical Cavity Surface Emitting Laser) or a photodiode. The element part 42 of the optical device 41 is a light emitting part when the optical device 41 is a light emitting element, and is a light receiving part when the optical device 41 is a light receiving element.

  In the optical device 41, the terminal portion 43 is electrically connected to the electrode 14 provided on the ferrule 12 by a bump 40 made of, for example, gold (Au). The connection by the bump 40 is performed by flip chip mounting in which the terminal portion 43 and the electrode 14 are connected through the bump 40 by ultrasonic vibration or heat. Alternatively, adhesion using an anisotropic conductive film (ACF) is also possible. Thus, the optical device 41 attached to the ferrule 12 has its element portion 42 disposed at a position opposite to the optical fiber insertion hole 13 of the ferrule 12.

In some cases, the ferrule 12 has an optical device 41 made of a light emitting element attached to the half of the front end 22a in the width direction, and an optical device 41 made of a light receiving element attached to the remaining half of the width direction.
The glass fiber 32 is bonded and fixed by an adhesive 35. The adhesive 35 is also filled between the front end 22a of the ferrule 12 and the optical device 41, and the optical device 41 and the ferrule 12 are firmly joined by the adhesive 35. The adhesive 35 is cured by subjecting the ferrule 12 to a heat treatment.

  When the photoelectric conversion module component 30 having the above structure is used as the photoelectric conversion module, the guide portion 24 may be cut. At the cut portion, the rear end portion of the glass fiber 32 is mirror-finished. The ferrule 12 has sufficient strength due to the rear end portion 23 having a width and thickness larger than those of the front end portion 22 when the guide portion 24 is cut and mirror-finished, so that it exhibits sufficient durability. be able to.

The photoelectric conversion module component 30 as described above is mounted on a circuit board 51 to form the photoelectric conversion module 31 as shown in FIG.
In this photoelectric conversion module 31, the front end portion 22 of the ferrule 12 constituting the photoelectric conversion module component 30 is fixed to the circuit surface 51 a of the circuit board 51 with a bonding material or the like.

  In this manner, the photoelectric conversion module component 30 is mounted at a predetermined position on the circuit board 51 by arranging the front end portion 22 on the circuit surface 51 a. Here, since the upper and lower surfaces of the front end portion 22 of the ferrule 12 constituting the optical fiber holding member 11 are parallel to the axis of the optical fiber insertion hole 13, for example, the lower surface of the front end portion 22 is disposed on the circuit board 51. By doing so, the ferrule 12 can be attached to the circuit board 51 very easily and smoothly.

  The electrical device 55 is mounted on the circuit surface 51a of the circuit board 51, and the terminal 55a of the electrical device 55 is electrically connected to a circuit pattern (not shown) formed on the circuit surface 51a. The electrical device 55 is, for example, an optical element driving IC such as a driver or a transimpedance amplifier.

  The terminal 55a of the electric device 55 mounted on the circuit board 51 is electrically connected to the pad surface 14a of the electrode 14 of the ferrule 12 by, for example, a bonding wire 56 made of gold (Au).

  The height of the front end portion 22 of the ferrule 12 of the photoelectric conversion module component 30 mounted on the circuit board 51 is substantially the same as the height of the electric device 55 mounted on the circuit board 51. Thereby, the length of the bonding wire 56 which connects the terminal 55a of the electric device 55 and the pad surface 14a of the electrode 14 of the ferrule 12 can be shortened as much as possible. Therefore, the high frequency characteristics in the bonding wire 56 can be improved and the influence of electrical noise can be suppressed as much as possible.

  The photoelectric conversion module 31 formed by mounting the photoelectric conversion module component 30 on the circuit board 51 has a plurality of optical fiber ribbons 48 on the rear end 23a side of the ferrule 12, as shown in FIG. The optical connector 50 to which the optical fiber core wire 49 is connected is connected. This optical connector 50 has a connector ferrule 44 formed of a material containing any of polyester resin, PPS resin, and epoxy resin.

  The optical fiber core wire 49 is obtained by coating a glass fiber (optical fiber) 45 having a core and a clad with a resin, and the glass fiber 45 exposed from the coating at the end of the optical fiber core wire 49 is attached to the connector ferrule 44. Is retained. And the end surface of each glass fiber 45 is exposed by the light entrance / exit surface 44a which is a surface facing the ferrule 12 in the connector ferrule 44. FIG.

  The optical connector 50 is provided with positioning pins (positioning guides) 47 projecting toward the ferrule 12 on both sides of the light entrance / exit surface 44a on the ferrule 12 side. These positioning pins 47 can be inserted and fitted into the positioning holes 25 formed in the ferrule 12. The optical connector 50 brings the front end surface of the glass fiber 45 close to the rear end surface of the glass fiber 32 held by the ferrule 12 by bringing the positioning pin 47 into the positioning hole 25 and approaching the ferrule 12 side. Can be placed.

  In the photoelectric conversion module 31 described above, optical transmission is performed between the optical device 41 and the glass fiber 45 of the optical connector 50 via the glass fiber 32 of the photoelectric conversion module 31.

  In the case where light transmission is performed from the optical device 41 made of a light emitting element to the glass fiber 45, the light emitted from the element portion 42 of the optical device 41 is transmitted through the glass fiber 32 of the photoelectric conversion module 31 to the optical connector 50. The light enters the glass fiber 45. Further, in the case where light transmission is performed from the glass fiber 45 of the optical connector 50 to the optical device 41 including a light receiving element, the light emitted from the glass fiber 45 is transmitted through the glass fiber 32 of the photoelectric conversion module 31. It will enter into the element part 42 of 41. FIG.

  Further, according to the photoelectric conversion module 31, since the optical connector 50 can be connected to perform optical transmission after being mounted on the circuit board 51, for example, the optical fiber core wire 49 side is connected after the optical connector 50 is connected. Even if a malfunction occurs, it is not necessary to replace the photoelectric conversion module 31, and high costs due to a decrease in yield can be suppressed. In addition, as compared with the structure in which the optical fiber core wire 49 is connected in advance, it is possible to ensure good assembly workability when attaching to the circuit board 51 or the like.

  In the above example, the optical fiber holding member 11 and the optical connector are formed by forming the positioning hole 25 in the ferrule 12 of the optical fiber holding member 11 and inserting the positioning pin 47 on the optical connector 50 side into the positioning hole 25. However, a positioning pin may be formed on the ferrule 12 of the optical fiber holding member 11 and the positioning pin may be inserted into a positioning hole formed in the optical connector 50 for positioning.

  In the optical fiber holding member 11 of the present embodiment, the adhesive accommodating portion 27 that is continuous with the optical fiber insertion hole 13 of the ferrule 12 passes from the entrance through which the glass fiber 32 in the optical fiber insertion hole 13 is inserted into the optical fiber insertion hole 13. Are formed along. Therefore, when the optical fiber insertion hole 13 is filled with the adhesive 35 and the glass fiber 32 is inserted, the optical fiber insertion hole 13 depends on the wettability in the optical fiber insertion hole 13 and the adhesive flow when the adhesive 35 is applied. Even if air bubbles are caught in the air, the air bubbles are sent out together with the adhesive 35 to the adhesive accommodating portion 27 and pushed out toward the entrance through which the glass fiber 32 in the optical fiber insertion hole 13 of the ferrule 12 is inserted. .

  This eliminates residual bubbles in the optical path between the element portion 42 of the optical device 41 and the glass fiber 32, reduces the coupling efficiency between the optical device 41 and the glass fiber 32 due to the bubbles, and causes variations in light intensity. Thus, the reliability of optical transmission and the yield can be improved.

  In particular, if the glass fiber 32 whose tip is cut obliquely with respect to the optical path axis is used, when the glass fiber 32 is inserted into the optical fiber insertion hole 13, bubbles remaining on the front side in the insertion direction are removed from the side adhesive. It can be pushed out well into the accommodating portion 27, and the remaining of bubbles in the optical path between the element portion 42 of the optical device 41 and the glass fiber 32 can be more effectively eliminated.

  Further, since the adhesive 35 pushed in when the glass fiber 32 is inserted into the optical fiber insertion hole 13 is sent out to the adhesive accommodating portion 27, application of pressure to the optical device 41 attached to the front end 22a of the ferrule 12 is suppressed as much as possible. Thus, problems such as poor connection can be prevented, and the reliability of optical transmission can be further improved and the yield can be further improved. In particular, when the adhesive accommodating portion 27 is formed to extend to the end face of the front end 22a of the ferrule 12, the effect of preventing residual bubbles and suppressing the application of pressure to the optical device 41 is great.

  Next, a method for manufacturing the photoelectric conversion module component 30 of FIG. 5 using the optical fiber holding member 11 will be described step by step.

First, the glass fiber 32 to be incorporated is cut to a length longer than the entire length of the ferrule 12. At this time, the front end of the glass fiber 32 has a substantially smooth surface. Specifically, the tip end portion of the glass fiber 32 is substantially smoothed by cleaving, chamfering, cutting, or laser cutting that damages a portion of the glass fiber 32 and applies a bending force to the scratched portion. A surface.
The glass fiber 32 may have its tip cut obliquely with respect to the direction perpendicular to the optical path axis, and the outer edge of the glass fiber 32 may be chamfered.

  Next, as shown in FIG. 9A, a ferrule 12 is prepared in which an optical device 41 is mounted on the front end 22a by ultrasonic flip chip mounting or the like. Then, the rib 20 and the optical device 41 at the front end 22a of the ferrule 12 are covered with a sheet 61, and the space between the front end 22a and the sheet 61 is sealed in a state of communicating with the outside at the notch portions 20a at both ends of the front end 22a. . Further, the adhesive 35 is filled into the optical fiber insertion hole 13 from the rear end 23a side of the ferrule 12. In addition, as the sheet | seat 61, it is preferable to use what consists of a material which can be easily peeled from the front end 22a after hardening of the adhesive agent 35 demonstrated later, and it is preferable to use the resin film consisting of a fluororesin.

  At this time, as shown in FIG. 14, it is preferable to fill the optical fiber insertion hole 13 with an adhesive using a filling needle (tubular member) 1. Specifically, the filling needle is inserted into the optical fiber insertion hole 13 of the ferrule 12, and the tip portion thereof is disposed in the vicinity of the optical device 41 mounted on the end surface 22a of the ferrule 12, so that the tip of the needle The needle is pulled out from the optical fiber insertion hole 13 while the adhesive 35 is discharged from the optical fiber insertion hole 13. Then, if the glass fiber 32 is inserted into the optical fiber insertion hole 13 filled with the adhesive 35 in this way, the remaining of bubbles in the optical path between the element portion 42 of the optical device 41 and the glass fiber 32 can be suppressed. it can.

  Next, as shown in FIG. 9B, the glass fiber 32 is inserted into the optical fiber insertion hole 13 from the rear end 23 a side of the ferrule 12 while pressing the sheet 61 toward the front end 22 a of the ferrule 12 with the jig 62. To do. The jig 62 is disposed so as to contact the rib 20 and the optical device 41 via the sheet 61. By pressing the jig 62 toward the front end 22a of the ferrule 12 in this state, the sheet 61 is pressed and fixed while being sandwiched between the jig 62, the rib 20 and the back surface of the optical device 41. The front end 22a is covered with the sheet 61, and can be sealed in a state where the space between the front end 22a and the sheet 61 is communicated with the outside through the notch 20a. At this time, if the ribs 20 are arranged on both sides of the optical device 41, the sheet 61 can be easily and reliably fixed.

  When inserting the glass fiber 32, first, the tip end portion of the glass fiber 32 is placed in the guide groove 24 a connected to the optical fiber insertion hole 13 opened at the upper side by the guide portion 24 of the ferrule 12. And this glass fiber 32 is inserted in the optical fiber penetration hole 13, and the front end surface of the glass fiber 32 is made to oppose the element part 42 of the optical device 41. FIG. At this time, the glass fiber 32 can be easily positioned with respect to the optical fiber insertion hole 13 by placing it in the guide groove 24 a of the guide portion 24 formed in the ferrule 12.

  When the tip of the glass fiber 32 inserted into the optical fiber insertion hole 13 comes into contact with the optical device 41, the glass fiber 32 is bent with a small insertion force upward or laterally in the guide portion 24. As a result, the glass fiber 32 is bent so that the insertion force is released, and an excessive contact force is prevented from being applied to the contact portion with the optical device 41.

  Further, by inserting the glass fiber 32 into the optical fiber insertion hole 13 from the rear end 23a side of the ferrule 12, the adhesive 35 is pushed into the front end 22a side. Then, the adhesive 35 is filled in a slight gap between the outer periphery of the glass fiber 32 and the inner periphery of the optical fiber insertion hole 13, and is pushed out from the optical fiber insertion hole 13 to the front end 22 a of the ferrule 12. 12 between the front end 22a of the twelve and the optical device 41.

  Further, the ferrule 12 is formed with an adhesive accommodating portion 27 continuous with the optical fiber insertion hole 13 of the ferrule 12 along the optical fiber insertion hole 13 from the entrance through which the glass fiber 32 in the optical fiber insertion hole 13 is inserted. ing. As a result, the adhesive 35 pushed in when the glass fiber 32 is inserted into the optical fiber insertion hole 13 is sent out to the adhesive accommodating portion 27, so that the pressure applied to the optical device 41 attached to the front end 22 a of the ferrule 12 is minimized. It can be suppressed.

  Moreover, as shown in FIG. 10, even if the bubble 35 is contained in the adhesive 35 pushed into the front end 22a of the ferrule 12 by the glass fiber 32, the adhesive 35 containing the bubble A is not contained in the adhesive container. 27 is pushed to the rear end 23a side of the ferrule 12. Therefore, residual bubbles A in the optical path between the element portion 42 of the optical device 41 and the glass fiber 32 are eliminated.

  At this time, if a glass fiber 32 whose tip is cut obliquely with respect to the optical path axis is used, the bubble A remaining on the front side in the insertion direction when the glass fiber 32 is inserted into the optical fiber insertion hole 13. Is pushed out together with the adhesive 35 to the side adhesive accommodating portion 27 more favorably.

  Further, the adhesive 35 pushed out from the optical fiber insertion hole 13 to the front end 22 a of the ferrule 12 also enters between the rib 20 of the ferrule 12 and the optical device 41. At this time, the rib 20 and the optical device 41 in the ferrule 12 are covered with the sheet 61, and the space between the front end 22a and the sheet 61 is sealed in a state of communicating with the outside through the notch portions 20a at both ends of the front end 22a. Therefore, the adhesive 35 is smoothly fed out to the side of the cutout portion 20a communicating with the outside and protrudes from the cutout portion 20a. At this time, since the sheet 61 is fixed in a state in which the jig 62 is in contact with the rib 20 and the back surface of the optical device 41, the adhesive 35 can be prevented from adhering to the back surface of the optical device 41. . The bubbles contained in the adhesive 35 move together with the adhesive 35 to the outside of the optical path between the element portion 42 of the optical device 41 and the optical fiber 32, or are discharged to the outside from the notch 20a. As a result, the adhesive 35 adheres to the pad surface 14 a formed of the electrodes 14 exposed on the upper and lower surfaces of the ferrule 12, or adheres to the lower surface of the front end portion 22 that becomes a die bonding surface to the circuit board 51. It is prevented.

  Thus, no bubbles remain between the element portion 42 of the optical device 41 and the glass fiber 32, and the lower surface of the front end portion 22 that becomes the pad surface 14 a made of the electrode 14 and the die bonding surface to the circuit board 51 The adhesive 35 can be filled without adhering to the back surface of the optical device 41, so that the reliability of optical transmission and the yield can be improved.

  Next, the ferrule 12 is subjected to a heat treatment at about 100 ° C. to 150 ° C. to cure the adhesive 35. At this time, since the thickness of the front end portion 22 of the ferrule 12 is thinner than the thickness of the rear end portion 23, the temperature on the front end portion 22 side first rises. Therefore, the adhesive 35 is cured from the front end portion 22 side where the temperature rises quickly, and then the rear end portion 23 side is cured.

  In this way, when the adhesive 35 is cured, the adhesive 35 is cured from the front end portion 22 side, so that the positional deviation of the glass fiber 32 at the front end portion 22 can be prevented. Thereby, the glass fiber 32 can be arrange | positioned to a predetermined position with high precision with respect to the element part 42 of the optical device 41, and the optical transmission / reception between the optical device 41 and the glass fiber 32 can be stabilized. And the reliability of optical transmission can be improved.

Thereafter, as shown in FIG. 9C, the sheet 61 is peeled off, and the rear end 23a of the ferrule 12 is polished. If a resin film made of a fluororesin is used as the sheet 61, it can be easily peeled off from the ferrule 12.
In the polishing process of the rear end 23a of the ferrule 12, the guide portion 24 of the ferrule 12 is cut from the root portion on the rear end portion 23 side together with the glass fiber 32, and the cut surface of the glass fiber 32 is mirror-finished. As a method of cutting the guide portion 24, there is dicing that cuts with a circular diamond blade that rotates at high speed. After the guide portion 24 is cut by this dicing, it is polished and the cut surface of the glass fiber 32 is mirror-finished. Can do.
And the optical fiber module component 30 in which the glass fiber 32 is built in the ferrule 12 and the optical device 41 is attached to the front end 22a of the ferrule 12 is obtained by the above process.

  In the above embodiment, the case where the glass fiber 32 is incorporated in the optical fiber insertion hole 13 of the ferrule 12 has been described as an example. However, as shown in FIG. The exposed glass fiber 33 may be directly inserted into the optical fiber insertion hole 13 of the ferrule 12 and bonded and fixed by the adhesive 35. Thereby, a pigtail type photoelectric conversion module component is obtained.

  Also in this structure, no bubbles remain between the element portion 42 of the optical device 41 and the glass fiber 32, and the pad surface 14a made of the electrode 14 and the front end portion 22 that becomes the die bonding surface to the circuit board 51 are also present. The adhesive 35 can be filled without adhering to the lower surface or the back surface of the optical device 41, so that the reliability of optical transmission and the yield can be improved.

  In the above embodiment, the adhesive accommodating portion 27 is formed from the entrance through which the glass fiber 32 is inserted into the optical fiber insertion hole 13 to the end surface of the front end 22a of the ferrule 12. What is necessary is just to be formed along the optical fiber penetration hole 13 from the entrance through which the glass fiber 32 in the fiber penetration hole 13 is penetrated.

As shown in FIG. 12, the adhesive accommodating portion 27 is formed from the entrance through which the glass fiber 32 in the optical fiber insertion hole 13 is inserted to the front of the front end 22 a of the ferrule 12 along the optical fiber insertion hole 13. Also good.
Also in this case, the adhesive 35 pushed in by the glass fiber 32 is sent out to the adhesive accommodating portion 27 and pushed out to the entrance through which the glass fiber 32 is inserted in the optical fiber insertion hole 13, whereby the front end 22 a of the ferrule 12. The application of pressure to the optical device 41 attached to the optical device 41 is suppressed as much as possible. Moreover, even if the bubble 35 is included in the adhesive 35, the adhesive 35 containing the bubble A is fed into the adhesive container 27 and the bubble in the optical path between the optical device 41 and the glass fiber 32. Is prevented from remaining.

  Moreover, in the said embodiment, although the adhesive agent accommodating part 27 was formed only in the upper side of the optical fiber penetration hole 13, as shown in FIG. May be. If it does in this way, the pressure added to the adhesive agent 35 at the time of glass fiber 32 insertion will become still smaller, and provision of the pressure to the optical device 41 is suppressed. Further, the adhesive 35 containing bubbles can be guided to the adhesive accommodating portion 27 with higher and lower efficiency, and the remaining of bubbles in the optical path between the optical device 41 and the glass fiber 32 can be prevented.

  When the adhesive 35 is filled into the optical fiber insertion hole 13 of the ferrule 12 using a needle, if there is no adhesive accommodating portion 27, the optical fiber insertion hole 13 is not exposed to pressure. It is preferable to insert the glass fiber 32 gradually.

11: Optical fiber holding member, 12: Ferrule, 13: Optical fiber insertion hole, 14: Electrode, 22a: Front end, 27: Adhesive container, 30: Component for photoelectric conversion module, 31: Photoelectric conversion module, 32 33: Glass fiber (optical fiber), 35: Adhesive, 41: Optical device, 45: Glass fiber (optical fiber)

Claims (6)

An optical fiber holding member having a ferrule in which an optical fiber insertion hole into which an optical fiber is inserted is formed, and an electrode is provided at the front end on the front side in the optical fiber insertion direction,
The optical fiber holding member, wherein the ferrule includes an adhesive container that is continuous with the optical fiber insertion hole, and is formed along the optical fiber insertion hole from an inlet through which the optical fiber is inserted. The optical fiber holding member according to claim 1,
The optical fiber holding member, wherein the adhesive accommodating portion is continuously formed up to a front end surface of the ferrule. The optical fiber holding member according to claim 1, the optical fiber inserted into and fixed to the optical fiber insertion hole formed in the ferrule of the optical fiber holding member, and a state of being electrically connected to the electrode And an optical device attached to the front end of the ferrule,
The optical fiber module component, wherein the optical fiber is fixed in a state of being inserted into the optical fiber insertion hole by an adhesive filled in the optical fiber insertion hole. The photoelectric conversion module component according to claim 3,
The optical fiber module component according to claim 1, wherein a tip surface of the optical fiber is inclined with respect to a direction perpendicular to the optical path axis. An optical fiber insertion hole into which an optical fiber is inserted is formed, and an optical fiber holding member having a ferrule provided with an electrode at a front end on the front side in the insertion direction of the optical fiber, and formed in the ferrule of the optical fiber holding member An optical fiber inserted into and fixed to the optical fiber insertion hole, and an optical device attached to the front end of the ferrule in a conductive connection state with the electrode, the ferrule being connected to the optical fiber insertion hole. The continuous adhesive container is a method for manufacturing a photoelectric conversion module component formed along the optical fiber insertion hole from an entrance through which the optical fiber is inserted,
With the optical device attached to the front end of the ferrule, the optical fiber insertion hole is filled with an adhesive,
By inserting the optical fiber from the rear end of the ferrule into the optical fiber insertion hole, the adhesive in the optical fiber insertion hole is sent to the adhesive container, and then the adhesive is cured. A method for producing a photoelectric conversion module component. It is a manufacturing method of the components for photoelectric conversion modules according to claim 5,
A cylindrical member for filling is inserted into the optical fiber insertion hole, the tip thereof is disposed in the vicinity of the optical device in the optical fiber insertion hole, and the cylindrical member is optically discharged while discharging the adhesive from the tip of the cylindrical member. A method for producing a component for an optical / electrical conversion module, wherein the optical fiber insertion hole is filled with an adhesive by being pulled out from the fiber insertion hole.

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